Open the outlanes as wide as possible. And remove the rubber posts on those inlane/outlane dividers, makes it much harder to bounce the ball out of those areas.
If a game comes with a middle post between the flippers, remove it.
On games with rubber posts next to ramps (like LOTR pictured below), replace with wider rubber making the shot even tighter and more precise to hit. Bricks come back at you super fast and makes the ball hard to control, sometimes SDTM.
Turn the settings to difficult/hard/extra hard. Multiballs and such are much harder to achieve. Going back to LOTR, the "KEEP" letters go out if you have all four of them lit and roll over one of the switches again.
Turn off extra balls.
Steeper angle of the machine can also make some games more difficult.
LOTR_Pin_(resized).jpg